BD9486F データシートの表示（PDF） - ROHM Semiconductor

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BD9486F

1ch Boost up type White LED Driver for large LCD

ROHM Semiconductor 

BD9486F

【setting example】

Above equation is translated as follows.

RVCC　[Ω] 

VIN　[V]  9　[V]

ICC　[A]  IDCDC　[A]  IREG　[A]

When VIN=12V, ICC=2.0mA, RREG=10kΩand IDCDC=2mA, RVCC’s value is calculated as follows.

RVCC　[] 

12　[V]  9　[V]

 667　[]

0.002　[A]  0.002　[A]  5.0　[V]　1　0000　[]

(ICC is 2.6mA(typ.)) . Please set each values with tolerance and margin.

Datasheet

●3.2.4 LED current setting

LED current can be adjusted by setting the resistance RS [Ω] which connects to ISENSE pin and ADIM[V].

Relationship between RS and ILED current

With DC dimming (ADIM<3.0V)

RISENSE



1

3



ADIM[V] [Ω]

ILED [ A ]

Without DC dimming (ADIM>3.0V)

RISENSE



1.015[V] [Ω]

ILED [ A ]

【setting example】

If ILED current is 200mA and ADIM is 2.0V, we can calculate RISENSE as below.

RISENSE



1

3



ADIM[V]

ILED [A]



1

3

2.0[V]

0.2[A]



3.33[Ω]

　

Figure 24. LED current setting example

●3.2.5 DCDC Oscillation Frequency Setting

RRT which connects to RT pin sets the oscillation frequency fSW of DCDC.

○Relationship between frequency fSW and RT resistance (ideal)

R RT



15000

fSW [kHz ]

[k  ]　

【setting example】

When DCDC frequency fsw is set to 200kHz, RRT is as follows.

RRT



15000

fsw [kHz]



15000

200[kHz]



75

[k]

　

Figure 25. RT terminal setting example

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TSZ02201-0F1F0C100240-1-2

13.Feb.2014 Rev.004

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